Hoist



April 11, 1950 F. PAR-KER 2,503,682

HOIST Filed Nov. 26, 1946 2 Sheets-Sheet 1 ATTORNEYS Patented Apr. 11 1950 UNITED :ES PATENT OFFICE I "fiasoass I v i HOIST Humphrey Es-Parker,Bufl a-lo, N. JYl.,.-lassignor==,to ColumbusMcKinnon ChainvCorpor-ation,Tonav Wanda, N. Y.,. a corporation of New -York Application November 26,IMGES-ei'iaFNoJ-W12x22 My invention relates ingeneral to hoists, :andmore .particularly .to hoists. having-light weight cast metal frames.

..:It.isI-now found desirable to make hoist frames or casings .of .diecast metal, and preferably of those .metalswhich are extremelylightweight. Such "metals, however, are usually of relatively low'shockresistance as comparedto somezof the heavier. metals and the amount of.sound metal whichcan beplaced inregions of. greatest stress indie castvhoist frames is limited owing to characteristics I of the die. casting.process. For example, itis well known thatwhi-le relatively thin.sections ofsoundmetal can be obtained in die casti-ng:.processes, whenit is attempted to. cast relativelyth-ick sections the metal in-theouter regions solidifies first, and then .as ,the metalin the center ofthe castingcools it contracts. This-contraction processformsvoids'throughout the center .section of the 1 metal. thereby forming animperfect casting :of reduced overall strength. Furthermore, suchlighter metals do not .usuallypossess the wearingqualities necessary forcontinuous useandwlong life in mechanisms of the character described. 7

-It has thereforebeen a principal object of .my invention to provide ahoistg frame of the lighter metals reinforced at points of greateststress by parts made from metal of greater shock and wear resistanceembedded in the cast metal of the hoist frame.

Another object has been to provide the reinforcing parts referred tohereinabove with means for anchoring them within the castingwithout'theus'e o'fii'anyabonding material.

g inotheraobject is to provide a wear-resistant insert molded within thecasting of the hoist frame forreinfOrcing the area where the greatestWear is imposed by operation of the load lch'ain.

-.'.The'se and other objects whichwill be apparent t'o'those skilled inthe art have :been' accomplished byl-Zthe device shown in theaccompanying-drawings, of which:

Fig. 1 is a front elevation of a hoist embodying my invention;

Fig. 2 is a side elevation of the complete hoist;

Fig. 3 is a sectional plan view of the hoist taken on line III-III ofFig. 1;

Fig. 4 is a vertical sectional view taken on line IV-IV of Fig. 3;

Fig. 5 is a fragmentary sectional view taken on line VV of Fig. 1; and

Fig. 6 is a fragmentary sectional view taken on line VI-VI of Fig. 2.

While I have shown and described a hand hoist,

' EClaims. (macer tion it l'S -0ibViOuS":that my invention .is:applicable to other v. types :of hoists, I such as those which areoperated by anrelectric motor or the like. .Referring-= to:thexdrawings, .the' hoist: comprises a:;frame-..-orrhousing 10 havinga-n'outer wallet! .enduw'alls I:2 andtS. Thehoist shownrisco'f the (typehaving .':a :single gear reductionand therefore ,:.provided with apinion l4 ;.mounte.d .uponnor :made integral -wit-l1"a :hand wheel shaftI 5. This shaft-is mounted :insuitable:antifriction bearings .16 .andQua-supported, respectively, by the-send walls 42 ar-rd l3. Thehand:wheel 12 I .of the device is mounted uponz..the outer-1 end.of' thehand .wheel shaft l5 1 and a is connected .thereto through the medium;2of' the .usual type nWest-on brake--22. Theaend' wall 12 isaextendedinzawa-ll extension 23, circular :in form. having its peripheryeccentrically arranged with respect. to the outer-wall I le'of theframe. .This wallextem. sio'n together vw'ithttheiinner wall .l 2 is so.formed as tol, provide a-r-ecess .24.: forithe reception of one ofnthe-flanges of the hand .wheel. The .outer periphery of thewallextensionlis flared outwardly asashown *in .Fig. =3," wherebytocprov ideu-ami inner guide .for .the .;hand chain 26. :Arra'nged inspaced relation witlr the innemgu-ide 25 is .an outer guide iwhi'ch issecured: to the inner, guide; by suitable bolts13l and spacers;3-2. Theouter chain guidais recessed; at 3-3 for the reception iofethe outerflange :of thehand wheel; and this: recess isrclose'd :by .means of-a..cover portion -34 formed integrally: with :thel'outer chain guide.

;.A -1oad-wheel='shaft; 35 :is rotatablysupportedrbyantifrictionbearings -.-36= and 40 carried by the end walls I2 and l 3,respectively. This shaft carriesa load gear-AI whicnmes-hes with thegeanpi-nion .14. These fggears are enclosed .by means =of2a.coverimember 42 which-is secured .to theframe M]. by suitable means.

I he .load Wheel-43 -of the .hoist is mounted-between the bearings 35and 40 and is preferably made integrally with the load wheel shaft 35.This wheel is provided with the usual teeth and notches for thereception of the load chain 44. The chain guide 45 of my invention ispreferably made of some suitable ferrous metal and is positioned at thepoint where the greatest wear is produced by the load chain. This guideis in the nature of an insert as shown in Figs. 3 and 4, and the metalof the frame is molded about it. The insert is provided with the usualchain groove 46 bounded by walls 50. These walls are flared outwardly asshown whereby when being molded within the casting during the process ofmolding, the insert will be securely anchored within the casting. Tabs5| are provided on the insert for anchorage in proper position in themold during the die-casting process. The customary stripper 52 isprovided and is suitably secured to the frame beneath the load wheel.

As is well known, one of the points of greatest stress in a hoist is inthe region of the point of attachment of the hoist hook; and wheneverthe frame is made of die cast metal, it is usually impracticable toprovide enough shock resistance in such metal within the available spaceto give sufficient strength to stand such stresses. In other words,since the die casting process inherently involves contraction andformation of voids in the centers of thick sections of die cast metal,it is not possible to employ only die-cast metal in the regions of suchstresses and to obtain the necessary strength and shock resistancethereat. Therefore, in carrying out my invention, I provide a strap 53made from a highly shock resistant material, such as, for example, aspecial steel having high ductility characteristics in combination witha die-cast frame. The strap comprises downwardly projecting legs 54joined by a horizontal portion 55. The horizontal portion extends acrossthe top of a yoke portion 56 provided on the frame, and to which thehoist hook 60 or other suspension member is attached. The hook isprovided with a pivotal portion Bl which extends down through anaperture 62 formed in the horizontal portion of the strap and throughthe yoke 56. This portion of the hook is retained in pivotal relationwith the yoke by means of a nut 63 secured to the lower end thereof. Theyoke is spaced from the top wall 64 of the casing thereby providing achannel 65 for passage of the nut when the device is being assembled.

As shown in Fig. 6, the side members 54 of the strap 53 are formed withapertures 66 which extend through the metal thereof and into which themetal of the casing flows when being molded about the strap. Such metalthus provides integral studs 70 which serve to anchor the strap withinthe casting and to thereby securely bond the parts together, whereby thestrap with its greater shock resistance will reinforce the cast metal ofthe frame at the stress points, thus providing adequate strength in thehoist for the loads to be placed upon it. The steel strap 53, having arelatively high modulus of elasticity and being placed across the top ofthe yoke 56, stretches less under shocks than does the die cast materialof the casing, which is of relatively low modulus of elasticity and,therefore, the strap absorbs the majority of the shock loads. By thisarrangement, the hoist casing may be generally constructed of any of thedie casting metals, whereby the advantages of such process are acquiredwhile at the same time the cast metal is reinforced so as to obviatedanger of breakage at the high stress points.

What is claimed is:

1. A hoist comprising a frame of relatively low wear-resistancematerial, a load lift wheel rotatably carried by said frame, a loadchain engaging said wheel, and a separate chain guide of relatively highwear-resistance material integrally molded within said frame for bearingengagement and cooperation with said load chain said guide having itsopposite inwardly extendin anchoring faces flaring away from each other,and integral aligning tabs projecting from said guide and embeddedwithin the metal of said frame.

2. A hoist comprising a cast metal frame and a hoist suspension membersecured to said frame,

said frame comprising two integral opposed side wall portions and anintegral yoke portion extending between and connecting said side wallportions, an inverted U-shaped reinforcin metal strap having itsdownwardly extending leg portions embedded within the cast metal of saidwall portions and being formed with apertures receiving the cast metalof said wall portions, the horizontal portion of said strap overlyingsaid yoke portion, said hoist suspension member bein connected to saidyoke portion and said horizontal strap portion for supporting saidhoist.

3. A hoist comprising a frame and a hoist suspension member secured tosaid frame, said frame comprising two opposed cast metal side wallportions and a cast metal beam abutment extending between and connectingsaid side wall portions, said frame being formed between said wallportions and below said abutment with a transverse opening, an invertedU-shaped reinforcing metal strap partly surrounding the opening andhaving its downwardly extending leg portions embedded within the castmetal of said wall portions and being formed wtih apertures receivingthe cast metal of said wall portions, the horizontal portion of saidstrap overlying said beam abutment portion, said beam abutment and saidhori-' zontal strap portion being each formed with a registeringaperture for the pivotal reception of the suspension member, andfastening means disposed within the transverse opening of the cas-' ingand secured to the lower end of the suspen-- sion hook for connectingthe latter to the frame. HUMPHREY F. PARKER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

